This instructible gives an easy fix for this problem which will make the carburetor operate as well (or at least close to as well) as it did when it was new and can be done in 30 minutes to an hour with the carb on the vehicle and with only minimal tools and a can of aerosol carburetor cleaner.
This process should work for about nine out of ten people with this problem, and if it doesn't work for you, it probably means that you need to do a complete carburetor rebuild.
Note: this is my first instuctable so give me some slack, and I will try to add more pictures/videos soon.
Step 1: Gather tools
1. Flat head screw driver
2. 3/16" wrench or driver
3. 1/4" wrench or ratchet
5. Carburetor cleaner (not shown; any brand from an auto part store should work)
6. Air compressor with 'blowgun" attachment. (not required but highly recommended)
Step 2: Diagnosis
The easiest way to tell if this will help your jeep is to start the jeep with the air cleaner off, once you have done this, open the choke and look down into the carb, if you see any dripping off either of the jets this instructable should help or fix any idle problems you are having, otherwise you may need to rebuild your carb or look into other problems.
Step 3: Remove Air Cleaner.
Step 4: Remove choke assembly
1. Remove wire clip from throttle linkage side of carburetor (see picture)
2. Remove 1/4" bolt from opposite side of choke rod (see second picture) and remove little flange thing the bolt held on (you may need to tap it with a screw driver, or something similar)
3. Remove the two 3/16" bolts holding the choke plate onto the choke rod (depending on your carburetor you may have small flat head screws here, but still remove them) Be extremely careful not to drop these screws into the carburetor, or you will have to spend quite a while "fishing" for them!!!
4. At with all of this removed, pull out the choke rod; the choke rod should slide out of its holes easily.
Step 5: Remove Venutri Assembly
At this point, you should be able to look into the carb and see two screws with holes in the heads, you need to remove these (be careful not to damage them, they are important).
After removing the two screws, you should be able to lift out the venutri assembly in order to clean it.
Note: the assembly will have two halves, the top one having two pins sticking out; be careful with these, although they are the primary source of clogging in this carburetor.
Step 6: Clean Everything
Also, use the cleaner to pray out the holes under where the venutri came from. WHEN YOU DO THIS, BE EXTREMELY CAREFUL NOT TO DISLODGE THE SMALL BALL BEARING IN ONE OF THE HOLES, IT IS CRITICAL TO THE OPERATION OF THE CARBURETOR.
Once you have done all this, carefully blow out the remaining cleaner with a low pressure air gun, pay attention to my warning above for this part.